What is winter cold? Cold is caused by a virus. Over 200 types of viruses are responsible for this disease, but Rhinovirus is the most common type of disease. 50% is thought to be responsible for cold cases. Coronavirus, respiratory serious virus influenza and parainfluenza are some other such viruses that can cause cold. How the cold start? This disease can be from people who are already infected with this virus. From having a physical relationship with any person who is already cold or touching the surface which is…